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Non-LTR Retrotransposons

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As the name suggests, non-LTR retrotransposons lack the long terminal repeats characteristic of the LTR retrotransposons. Additionally, both LTR and non-LTR retrotransposons use distinct mechanisms of mobilization. Non-LTR retrotransposons are further divided into two classes - Long interspersed nuclear elements (LINEs) and short interspersed nuclear elements (SINEs), both of which occur abundantly in most mammals, including humans. Some of the active non-LTR retrotransposons in humans are L1...
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Epigenetic changes alter the physical structure of the DNA without changing the genetic sequence and often regulate whether genes are turned on or off. This regulation ensures that each cell produces only proteins necessary for its function. For example, proteins that promote bone growth are not produced in muscle cells. Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
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Diploid organisms inherit genetic material through chromosomes from both parents. Copies of the same gene are known as alleles. In most cases, both alleles are simultaneously expressed and allow various cellular processes to function optimally. If one of the alleles is missing or mutated, the expression of the other allele can compensate; however, this is not true for all genes.
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Updated: Oct 30, 2025

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Transcriptomic and Epigenomic Landscape in Rett Syndrome.

Domenico Marano1, Salvatore Fioriniello1, Maurizio D'Esposito1

  • 1Institute of Genetics and Biophysics 'A. Buzzati-Traverso', CNR, 80131 Naples, Italy.

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Summary

Rett syndrome, a severe neurodevelopmental disorder, stems from mutations in the Methyl-CpG binding protein 2 (MECP2) gene. This review details the resulting widespread epigenetic and gene expression changes in patients and models.

Keywords:
DNA methylationMeCP2Rett syndromechromatinepigenomicshistone modificationsnon-coding RNAstranscriptomics

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Area of Science:

  • Neuroscience
  • Genetics
  • Epigenetics

Background:

  • Rett syndrome (RTT) is a severe neurodevelopmental disorder causing intellectual disability in females.
  • Most RTT cases result from mutations in the Methyl-CpG binding protein 2 (MECP2) gene.
  • MeCP2 is crucial for epigenetic regulation and chromatin organization.

Purpose of the Study:

  • To review current knowledge on transcriptomic and epigenomic alterations in RTT.
  • To highlight the impact of MECP2 defects on gene expression and epigenetic modifications.

Main Methods:

  • Review of existing literature on Rett syndrome.
  • Analysis of transcriptomic and epigenomic data from RTT patients and animal models.

Main Results:

  • MECP2 mutations lead to extensive alterations in the epigenome.
  • Unbalanced epigenetic modifications and altered gene expression (coding and non-coding) are observed.
  • These changes have critical downstream biological consequences.

Conclusions:

  • Defects in the multifaceted MeCP2 protein cause large-scale epigenomic dysregulation.
  • Understanding these alterations is key to addressing the consequences of RTT.